Unsubscribe message doesn't display consistently
When an individual unsubscribes from a mailing group, they get a standard message confirmation message that says they have been unsubscribed (see image 001). However, the message specified in the Headers, Footers and Automated Messages list includes a link to resubscribe (image 002) that doesn't appear.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information